How popular is Maristela?

Maristela is a rare first name for females but a somewhat popular surname for all people (#109328 out of 150436, Top 73%). (2000 U.S. Census)

Which version is better?

with similar and related girl names. Mary(#124 the previous year), Maritza(#1201), Mariella(#1433), Mariela(#1560), Mariel(#1839), Marita, Marietta, Estela, Marilla and Mariska are the prominent variation forms of Maristela (not ranked). Other forms, like Maridel, are uncommon. Adoption of these forms of Maristela was at its apex during the years 1880-1889 (adoption of 8.23%) and is now much less (adoption 0.19%, ▼97.6%), with versions such as Marietta falling out of fashion. (Top 2000 Names, 2015)